Thane: A young woman has been arrested here for allegedly killing her 14-month-old child with the help of her stepfather, police said today.

According to the complaint filed by the 23-year-old woman's mother-in-law, the accused allegedly beat her child to death on August 2 with the help of her stepfather, with whom she was having an extra-marital affair, said Inspector Rajan H Sasthe of Bhiwandi police.

The woman was arrested late last night from the Bhiwandi area here, he added. Complainant Irfana Mohamad Aslam Ansari has claimed that her daughter-in-law, Firdous Khuyyam Ansari, was having an illicit affair with her stepfather Rashid Janmohammad Ansari (35). She has alleged that the child was a hindrance in their relationship, so the duo killed the baby, Sasthe said.

The accused stepfather is at large since August 2 and a case under IPC has been booked in the matter, he said.